In Microsoft's continued effort to pay people to use their products, they are "burying" $10,000 somewhere on the web and will be giving clues out, but IE 8 (or Firefox + the user-agent switcher plugin) are the only browsers capable of finding the clues. In fact, if you go to the page with a different browser, it will make fun of you:
Chrome: "But you'll never find it using tarnished Chrome."